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Is there a way to send a message to all logged-in users on an OS X (Snow Leopard) server? Sometimes I need to reboot the server and would like to give everyone a notice of the impending reboot that gives them five minutes to log-out before I proceed.

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What kind of logged in users? web, smb/afp, ssh, etc? – Scott Pack May 11 '10 at 2:22
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If you have OS X server and your users are using AFP, you can send them a message in the AFP section of the Server Admin tools. Also, if you are using Apple Remote Desktop and have it authorized for all computers, you can send a message even if users don't use AFP.

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In BSD the command would be wall and OS X is based on BSD, you might give it a try.

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That will go to most ttys, yes. The window manager won't, however, pick up the message for display on the console tty. – Scott Pack May 11 '10 at 2:28
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